Compressed-air pump.



W. E. STUART. COMPRESSE) A' PUMP. l APPLIUATION HLD rmmo, 19.12.

1.945,99?, Patented Dem-5,1912.

n' sns Aran orne.

WILLIAM E. STUART, OF SAN FRANCISCO, CALIFORNIA.

COMPRESSED-AIB PUMP.

Application led February 20, 1912. Serial No.' 678,790.

Specication of Letters'Patent.

Patented nec. s, 1912.

To all whom t may concerm- Be it'known that I, WILLIAM E. STUART,

- through a series of ports, in which the means for opening and closing said ports shall be,

of light weight and easily operated.

In the accompanying drawings, Figure 1 is a broken side view of my invention shown as appliedto a deep well.; Fig. 2 is an-enlarged vertical sectiornpartly in side elevation, of a portion of the well, showing the compressed air ports andthe sleeves and rod for controlling the same; Fig. 3 is a similar View of the lower portion of the well, showing the lowermost air ports, sleeves and rod for controllin the same; Fig. 4 vis a broken side view o1: the upperl most portion of my improved pump; Fig.

5 is a vertical section'of a detail.

Referring to the drawing, l indicates a concrete structure, supported upon the surv face of the` ground around a well 2 which is to be pumped. Supported upon the top of saidstructure byl standards 3 is a cylinder 4, and secured to and depending from the base of said cylinder is a smaller cylinder 5.

Compressed air from any suitable source is supplied by the pipe 6, and a branch pipe,

7 therefrom connects with the intl 1r of the cylinder` 5 through its side. In L r i cylinder 5 canl be reciprocated vertically,V by means to be presently described, a tube 8 which passes through a stufling box 9 into the cylinder 4, and is connected at its upper end to a hollow piston 11 adapted to reciprocate in the cylinder 4. The compressed air, after flowing'intothe cylinder 5, passes through a hole 12 in a coupling 13 connecting said-tube 8 with a depending rod 15,

and thus obtains access to the interior of said tube 8. lIt iows upwardly therein and through a passage 14 and outlet 16, being controlled by a needle valve 20. The outlet 16 leads into a chamber 18 in the interior of ,the hollow piston 11. Having its ends secured in the ends of the hollow piston is a regulating hollow cylinder 17- into the ends of which compressed air passes from the chamber 18 by two passages 19, 21, so that a piston 22 therein is balanced. Said piston 22 is formed with upper and lower heads 23,

24, and with a spacing body 26, the parts of the piston between said body and heads being reduced in diameter and thus forming, with the cylinder 17, annular chambers 27, 28. In the position of the parts lshown in Fig. 4 the compressed air passes, on the outward' stroke of the-piston 11 yby a passage 29 'in the cylinder 17 into the chamber 27 and thence into a passage 31 in the wall of the cylinder and leading to the lower portion J of the main cylinder 4, The compressed air continuing to pass in this way causes the piston 11 to be forced upward' untila rod 32, connected to the piston 22, and extending through the upper end of the cylinder 17, engages a setscrew 33 secured in the upper end of the cylinder 4. When this occurs, since the piston 11 still continues to ascend, and the piston 22 no longer ascends, a lever Y34, which has a pivot 36 on a holding frame 37 carried with the piston 11, is rocked, since its free en d engages two lugs 38 on the rod 32, and is therefore no longer moved upwardly with the piston 11, while the pivot 36 is, so moved upwardly. The other end of the lever 34 is pivoted at 39 to Aan arm 41, which can slide through a collar .42 pivoted on the frame 37. Surrounding the arm 41 is a coiled spring 43, which is compressed between said collar 42 and a stop 44 on said arm. As the pivot 36 is carried upward, the end of the lever 34 connected to the arm 41 is carried past the center line, and immediately thereupon the spring 43 operates to move the pivoted end pf the lever 34 still farther in an upward direction, and consequently to move the free end of said lever in a downward direction, thus, by the engagement of said free end with the lugs 38, causing the piston to be positively carried to its lowermost'position with reference to the cI linder 17.

When the piston 22 is forced-downward.

' .by the, action of the lever 34, it causes to be closed the passage 29, thus cutting oi the supplyof compressedir. In this position of the piston 22, compressed air can escape from the part of the' cylinder 4 below the piston 11, to the part above said piston, by a passage 46 leading to the chamber 28 and by a passage 47, leading from said chamber to the upper portion of the cylinder 4 through a pin-valve opening 48, and thenceto the atmosphere throughl an opening 49 in the end of said cylinder 4. As compressed air is withdrawn from the lower end of the cylinder 4, the weight of the several parts will cause the piston 11 to descend, the rate.

of descent being controlled by the extent of opening ofthe pin valve 51. When the pist0n 11 arrives at the bottom of the cylinder 4, a rod 52 secured to the piston 22, and ex-A tending through the lower end of the cylinder `17 engages a set screw-53 in the lower end of the cylinder 4 and arrests the downward movement of the piston 22 while the piston 11 still continues to move downward,

' so that an action precisely similar `in charspace between said inner and outer pumpv tubes by oblique ports 58.l v

The operatiu rod 15 passes from the cylinder 4 throug ,a packing box 59, down through the oil receptacle inclosed by the structure 1, and through a packing box 62 in the pump head 55, and into said annular space. To saidoperatin rod 15 are secured sleeves 59 which fit .snugIy around the inner pimp tube 56. These sleeves are so spaced om one another as to allow the air ports 58 through said inner pump tube to receive air as said sleeves ascend and descend. To the lower end of the outer pump tube 57 iS screwed a reduced fitting 61, into lwhich is screwed the upper end of a depending tube 62, to increase the depth of submersion, said fitting 61 also carrying a socket 63 to receive the lo-w'er end of the inner pump tube 56. In the inner pump tube 56, just above the socket 63, are formed air ports 64, which are covered by a loose sleeve 66, which sleeve has also air ports 67. The loose sleeve 66 is connected to an adjusting rod 68, which extends in the annular space between the inner and outer pump tubes up to the surface of `The utility'o connected to all of said sleeves and extendthe ground and -passes through ak stuffing box 69 in the pump head 55 to a set nut 71,

v, i.rom. ,which vpoint the sleeve 66 can be'raised or lowered to vary the size of the register-l ing-[passages through the air ports 64 67.

the U. Spatent anted to me .l an. 9, 1912, No. 1,014,422, I isclosed a compressed air pump inv which the compressed air was .admitted to the pump tube. by a centrally located conduit formed in sections connected together and having closures for the compressed air ports adjacent to the several connections. In that device the compressed air was admitted to the liquid to be pumpedby raising and lowering the several sections 1n succession. In the present form of the device, in which the air is supplied outside of the pump tube, such a construction is not practicable on account of the my present device will therefore be apparent. i

1. A compressed air pum comprising a pump tube, a tube surrounding said pump tube, means for supplying compressed air into the annular space between said air tube and the pump tube, the pump tubehaving openings therethrough at intervals along its length, sleeves surrounding said tube adjacent to the openings therethrough, and a rod ing to the 'top of said pump tube.

2. In a compressed air pump, means for. controlling the supply of compressed air comprising a cylinder, a piston movable therein, and means for admitting compressed air to the ends of the-cylinder, -comprising a cylinder, conduits leading through the interior of the cylinder Afrom the source of supply of compressed air to the respective ends of the first-named cylinder, a piston in said second cylinder arranged to control said conduits by its movement in the cylinder,means whereby such movement is produced by a movement in its cylinder of the rst-named piston, a lever operatively engaging said second-named-piston, and a spring for actuating said lever, said spring being located and arranged -to be energized by thev movement up to and past a dead center of said lever due to the movement of the firstnamed piston, and, when 'said lever has moved past said dead center, to actuate saidlever to move said second named piston.

eat weight of the pump tube.

iio

3. A compressed air pump comprising a length, closures for the respective openings,

and means independent of said'tubes conneeted to said closures and extending to the l my hand in the presence of two subscribing top of the pump tube and arranged to be Witnesses actuated thereat, said closures being so 10- cated with reference to their respective openings that, by the operation of said means Witnesses:

said openings are closed in succession. FRANCIS M. WRIGHT,

In testimony whereof I have hereunto set D.. B. RICHARDS.

WILLIAM E. STUART. 

